The Magnitude of the Magnetic Field That a Long and Extremely

Multiple Choice

The magnitude of the magnetic field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10^-3 T.How much current is flowing through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

A) 30 mA
B) 190 mA
C) 19 mA
D) 380 mA